The coming unmasking of Red John on
"The Mentalist" isn't the only upheaval the show will face in Season 6. Two members of the regular cast will be leaving the CBS series.

Amanda Righetti and
Owain Yeoman, both of whom have been with the show from the start, will depart late in the 2013-14 season,
TVLine reports. Just how their characters, Grace Van Pelt and Wayne Rigsby, leave the show remains to be seen.

Last season's "Mentalist" finale narrowed the
list of Red John suspects to seven -- and strongly implied Red John is someone Jane (
Simon Baker) knows from his time working with the CBI. Rigsby and Van Pelt aren't on the suspect list, but the Red John reveal could tie into their exit from teh bureau.